Novak Djokovic, left, congratulates Rafael Nadal after their U.S. Open men's championship match on Monday night in New York. Nadal won his ninth Grand Slam title and first U.S. Open with a 6-4, 5-7, 6-4, 6-2 victory.

Novak Djokovic, left, congratulates Rafael Nadal after their U.S. Open men's championship match on Monday night in New York. Nadal won his ninth Grand Slam title and first U.S. Open with a 6-4, 5-7, 6-4, 6-2 victory. (Charles Krupa / Associated Press)